Packing



Jan. 8, 1935. E, ooms 1,987,120

PACKING Filed Feb. 5, 1930 INIVENTOR flit/24 ATTORNEY Patented Jan. 8, 1535 PATENT OFFICE PACKING Evarts G. Loomis, Newark, N. J., assignor to The Dorin Corporation, Union City, N. J., a corporation of New Jersey Application February 1930, Serial No. 426,072

4 Claims.

This invention relates to packings. More particularLv, it relates to packing materials having definite lengths and high internal strength,

whereby they may be distorted and successfully 5' withstand the stresses occasioned thereby without any substantial disintegration.

Prior to this invention, packing compositions have been molded and formed into definite lengths of suitable cross-sections. These materials were incapable of resisting the stresses produced in the distortion thereof. Thus, when they were carelessly and roughly. handled, pulled, bent, flexed,

coiled or subjected to any similar operation, thecohesion between the various components was destroyed. To minimize this defect the packings were provided with exterior coverings. Though these coverings prevented the loss and scattering of the ingredients of the product when distorted, nevertheless they did not impart any internal strength to the molded product.

I have found that by interiorly reinforcing the molded composition, I can produce a packing having a high internal strength capable of successfully resisting the stresses occasioned by distortion resulting from pulling, bending, flexing, coiling or the like.

It is therefore an object of this invention to produce a packing of high internal strength comprising an interiorly reinforced molded packing composition.

Another object of this invention is to provide a packing of high internal strength comprising a molded packing composition reinforced with strands or thread-like materials incorporated therein and extending preferably longitudinally therethrough.

Additional objects will appear from the following description, appended claims and accompanying drawing forming a part of this invention and in which:

Figure l is a perspective view of a packing prepared in accordance with the principles of this invention.

Figure 2 is a cross-section of the packing illustrated in Figure l.

Figure 3 illustrates one form of a die mechanism capable of being employed in the manufacture of the packing material.

Figure 4 is a detail illustration of the means for embedding the strand in the packing composition.

According to this invention, a plastic packing compositionjis pressure molded by being extruded through any suitable shaping mechanism, such as a die, whereby it is given a definite shape and length. At some stage in the shaping or the extrusion a strand of material is embedded in the composition in such a manner that it is incorporated and extends longitudinally through the product. The incorporated strand reinforces the product and imparts thereto. a relatively high internal strength which permits distortion and pulling without any substantial disintegration. To more. clearly explain the invention, reference is made to the accompanying drawing in which like reference numerals designatelike parts or elements.

Referring now to Figure 1, the reference numeral 1 designates the molded or extruded packing composition of any type and the reference numeral 2 designates the strand incorporated therein. 7 For reasons which will become apparent from the hereinafter described method, the packing may be provided with a covering 3, preferably spirally wrapped thereon, of a frangible material.

The packing constituting this invention may be made in various manners. In Figure 3 there is illustrated one form of a device which may be employed to produce the packing. This device consists of a die member 4 having a passage 5 extending therethrough and terminating at one end thereof in an opening 6 through which the packing composition is discharged from the device. The shape and size of this opening depends on I the desired cross-section of the packing. If the packing is to be circular in cross-section, then this hole is made round; on the other hand, if the packing is to be made elliptical, square or of any other configuration, then this aperture is made of the corresponding contour. The other end of the passage is suitably connected to any well known means for supplying and feeding the packing composition to be processed 'in the die; The passageway 5 is made of different diametrical dimensions throughout its length, as indicated by the reference numerals '7, 8 and 9. Between the various sized cross-sections there are provided shoulders 10 and 11 which aid in reducing thematerial to the desired size as well as finish the surface of the packing. I Suitably disposed in the die member and preferably-adjacent the shoulder 11 are means which groove or channel the composition and embed the strands 2 in the groove. These means comprise ,a bolt-like member 12 having a shank, the terminal portion 13 of which is smaller in cross-section than the threaded portion 14; By means of the threads 14 cooperating with a threaded hole in the die, the member 12 may be adjustably mounted in any predetermined position. The member 12 is also provided with a passage 15 extending through the center thereof for guiding the strand 2, as will presently appear. When in properoperative position the terminal portion 13 extends into the passage 5, as clearly illustrated in Figure 3, and serves to form a channel or groove in the material engaging therewith. The strand 2, suitably disposed on a freely rotating spool, is fed through the passage 15, and, as the composition is grooved, it is disposed therein. The material at this stage of the process is continued to be forced through the die passage. As it passes the shoulder 11 prior to entering that portion of the passage designated by the reference numeral 9, said shoulder smooths over and fills up the grooves, whereby the strand 2 is embedded in the mass and hidden from view upon exit from the aperture 6.

The number of mechanisms for grooving the composition and embedding the strand depends on the number of reinforcing elements desired in the final product. If, for instance, a single reinforcing element is desired, then'only one such member is necessary. On the other hand, if a plurality of reinforcing elements is desired, then a corresponding number of these mechanisms is employed.

Due to the threaded construction and arrangement, the member 12 may be adjusted to any desired position. Thus, the reinforcing elements may be located at any predetermined positions in the product. I

The reinforcing elements may be formed of any of a number of materials. For instance, they may be strands, such as threads or cords of any textile material including cotton, hemp and artificial silk, or they may be formed of rubber, wire and the like. It is only essential that the reinforcing elements be .of such a composition that does not interfere with the successful operation of the packing material in its intended use.

The packing material, as it comes from the die, possesses a high internal strength. It is capable of withstanding the stresses occasioned by distortion and longitudinal pull.

The product, if desired, may be encased or coated with any frangible and easily disruptible materials. It is obvious that numerous materials are suitable for this purpose. I prefer to spirally wrap a ribbon of material, such as regenerated cellulose, in such a manner that the adjacent convolutions thereof overlap.

.This invention may be successfully practiced with lubricating compositions comprising finely divided anti-friction metallic materials, asbestos and/or other fibers, graphite admixed with a suitable binder, such as an oil or wax, or a composition binder, including a colloidal hydrocarbon, such as rubber homogeneously mixed with menhaden oil.

The packing constituting this invention may, be used to pack glands, stuffing boxes and the like. It is particularly adapted for packing of a gland having a moving part, such as a piston, reciprocating therein due to its lubricating quality. To pack such a structure it is only necessary to remove the follower, wind the .packing about the shaft in any manner, and then force the packing into the gland by screwing down the follower. In case a covered packing is employed, the covering will be disrupted in a substantially short time by the reciprocation of the moving parts, thus quickly and readily permitting the useful ingredients to function.

Since it is obvious that various changes and modifications may be made in the specific details above described, this invention is not restricted thereto except as defined by the appended claims.

I claim:

- 1. A packing of high internal strength comprising a die-extruded packing composition containing finely divided anti-friction metallic materials, fibrous materials, a solid lubricant and a binder, and having one or more strands incorporated in the molded composition and extending longitudinally therethrough.

2. A packing of high internal strength comprising a die-extruded packing composition containing finely divided anti-friction metallic materials, fibrous materials, a solid lubricant and a binder, and having one or more metallic strands incorporated in'the molded composition and extending longitudinally therethrough. v

3. A packing of high internal strength comprising a die-extruded packing composition containing finely divided anti-friction metallic materials, fibrous materials, a solid lubricant and a binder, and having one or more rubber strands incorporated in the molded composition and extending longitudinally therethrough.

4. A packing of high internal strength comprising a die-extruded packing composition containing finely divided anti-friction metallic materials, fibrous materials, a solid lubricant and a binder, and having one or more textile threads incorporated in the molded composition and extending longitudinally therethrough.

EVARTS G. LOOMIS. 

